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lang-java
doubletemporaries is only free on x86 with the x87 FPU, not with SSE2. Auto-vectorizing a loop withdoubletemporaries means unpackingfloattodouble, which takes an extra instruction, and you process half as many elements per vector. Without auto-vectorization, the conversion can usually happen on the fly during a load or store, but it means extra instructions when you're mixing floats and doubles in expressions.